Shaft-coupling



(No Model.) I

J. Q. STEWART.

SHAFT COUPLING.

No. 439,981. Patented Nov. 4, 1890.

WITNESSES: INI/ IVTOR:

ATTORNEYS ml mam wsrzns co., moro-urum, msmuuton n c UNITED STATES PATENT OFFICE.

JAMES Q. STEWART, OF RIVER VALE, INDIANA.

SHAFT-COUPLING.

SPECIFICATION forming part of Letters Patent No. 439,981, dated November 4, 1890.

Application filed July 7,1890. Serial No- 86'7,977. (No model.)

To all whom it may concern.-

Be it known that I, JAMES Q. STEWART, of River Vale, in the county of Lawrence and State of Indiana, have invented a new and useful Improvement in Shaft Oouplings, of-

which the following is a full, clear, and ex act description.

My invention relates to an improvementin shaft-couplings, and has for its object to provide a means whereby the sections of a sectional shaft may be expeditiously and conveniently united, and effectually prevented from disengaging one from the other and becoming loosened when the shaft is revolved; and the invention consists in the novel construction and combination of the several parts, as will be hereinafter more fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of two sections of a shaft united in accordance with my invention, and Fig. 2 is a longitudinal section on line m 00 of Fig. 1. Fig. 3 is an end view of one section of the shaft, and Fig. 4 is a corresponding view of the second or abutting section.

One section A of the shaft is provided at its end with a threaded longitudinal opening or aperture 10. The other section A, adapted to engage with the section A, is provided at its abutting ends with a screw extension 11, adapted to enter the threaded aperture 10 of the said section A.

The section A is provided with preferably four spaced longitudinal channels or recesses 12, the side walls of which channels or recesses are undercut. The said channels or recesses 12 extend through the apertured end of the section. The section A is provided, preferably, with six longitudinal wedge-shaped dovetail recesses or channels 13, which recesses or channels extend through the end of the section provided with the threaded extension 11. In each of the recesses or channels of the section A a key 14 is held to slide dovetail in cross section, the

with the inner ends of the channels or recesses 12. Whenthe two sections have been screwed together to cause their opposed ends to engage, one or two of the keys 14 will enter a corresponding number of the recesses or channels 13 in the section A, the recesses or channels 13 in said section A being so located with respect to the position of the keys in the opposed section A that at least one, and possibly two, of the channels 13 will register, or practically so, with a cor responding number of the channels 12 of the section A, and one of the keys will drop the full length of the recess or channel 13, while the other key may but partially enter its recess.

a greater or less number of channels or recesses may be produced in each of the sections; but preferably the greater number of channels or recesses is produced in the section A than in the section A. At all times the number of receiving channels or recesses is greater than the number of keys.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a shaft-coupling, the combination, with a section of a shaft having longitudinally-extending undercut or dovetail re- I desire it to be distinctly understood that cesses and sliding keys conforming to the contour of said recesses, of an engaging-shaft section having undercut longitudinally-extending recesses to receive the adjacent ends of said keys, the abutting ends of the two sections having a threaded aperture and threaded extension, respectively, substantially as shown and described.

2. In a shafbcoupling, the combination, with the engaging shaftssections A A, provided at their abutting ends witha threaded aperture and a threaded extension, respectkeysbeing flush with the exterior of the shaftively, and exterior longitudinallyextendsections, substantially as shown and deing undercut grooves 12 133, closed at their scribed.

outer ends, the grooves in the section A be- JAMES Q. STEWART. 5 ing wedge shape, of dovetail sliding keys 14, Witnesses:

mounted in the grooves 12, and wedge shape JONATHAN TURLEY,

at their lower ends, the outer surface of the GEO. R. STANLEY. 

